idle Posted January 13, 2021 Share Posted January 13, 2021 Dell Optiplex 3046 SFF, Core i5-6500, 16Gb DDR4-2400, Intel HD530, 2560x1440, Big Sur 11.1, DELL U2718Q 4K I installed Big Sur, the config was taken from some forum, everything works fine except for displaying an image at a maximum resolution of 2560 × 1440. The computer is connected to the monitor via DisplayPort. DELL U2718Q monitor supporting 4K output. Windows on the same computer outputs 3840x2160 60Hz. Can someone help to get to output 4K resolution in Big Sur? EFI_OC.zip ioreg.zip Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted January 13, 2021 Moderators Share Posted January 13, 2021 You'll most likely need to increase the DVMT Pre-alloc to 128MB using a shell command since it's not available in the BIOS Link to comment Share on other sites More sharing options...
idle Posted January 17, 2021 Author Share Posted January 17, 2021 Yes, I heard about it ... If I'm not confusing anything, should I enter some commands using modGRUBShell.efi? Now my system allocates 1536 MB, tell me what commands should I enter and what other changes should I make to my config.plist? PS Sorry for my English ... Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted January 17, 2021 Moderators Share Posted January 17, 2021 modGrubShell.efi should work but you need to find the specific value to change for your system See here Link to comment Share on other sites More sharing options...
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